Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
6-4
Cisco AsyncOS 8.5 for Email User Guide
Chapter 6 Sender Reputation Filtering
Editing Sender Reputation Filtering Score Thresholds for a Listener
Figure 6-2
Sender Reputation Filtering Example
Recommended Settings for Different Sender Reputation Filtering Approaches
Depending on the objectives of your enterprise, you can implement a conservative, moderate, or
aggressive approach.
aggressive approach.
Editing Sender Reputation Filtering Score Thresholds for a
Listener
Listener
Use this procedure if you want to change the default SenderBase Reputation Service (SBRS) score
thresholds or add a sender group for reputation filtering.
thresholds or add a sender group for reputation filtering.
Approach Characteristics
Whitelist
Blacklist
Suspectlist Unknownlist
Sender Base Reputation Score range:
Conservative
Near zero false
positives, better
performance
positives, better
performance
7 to 10
-10 to -4
-4 to -2
-2 to 7
Moderate
(Installation
default)
default)
Very few false
positives, high
performance
positives, high
performance
Sender Base
Reputation Scores
are not used.
Reputation Scores
are not used.
-10 to -3
-3 to -1
-1 to +10
Aggressive
Some false
positives,
maximum
performance.
positives,
maximum
performance.
This option shunts
the most mail
away from
Anti-Spam
processing.
the most mail
away from
Anti-Spam
processing.
4 to 10
-10 to -2
-2 to -1
-1 to 4
All approaches
Mail Flow Policy:
Trusted
Blocked
Throttled
Accepted